Expand event in VS .NET

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Expand event
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The Expand event is generated when a user clicks a tree node to expand it. You can trap this event to control the formatting and decide the contents of a particular node and its child nodes. The event handler for this event is OnExpand and has the following syntax: OnExpand(sender As Object, e As TreeViewClickEventArgs) The second parameter is an object of the TreeViewClickEventArgs class and contains the data pertaining to the Expand event.
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SelectedIndexChanged event
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The SelectedIndex event is generated when a user clicks the TreeView control to change the active tree node. This causes the TreeView control to move the highlight from the node that was selected earlier to the newly selected node. You can trap this event to control the formatting and decide the contents of the selected node. The event handler for this event is OnSelectedIndexChanged and has the following syntax: OnSelectedIndexChanged(sender As Object, e As TreeViewSelectEventArgs) The second parameter is the TreeViewSelectEventArgs object and contains the data pertaining to the SelectedIndexChanged event. This object has the following properties that can be used to make changes to the appearance of the selected node: NewNode: Refers to a Node object that represents the tree node that has been selected. OldNode: Refers to a Node object that represents the tree node that was previously selected. Rendering a TreeView control The following code renders a TreeView control in a page: <%@ Page Language="VB" %> <%@import namespace="Microsoft.Web.UI.WebControls"%> <%@Register TagPrefix="mytree" Namespace = "Microsoft. Web.UI.WebControls" Assembly="Microsoft.Web.UI.WebControls"%> <html> <script language="VB" runat="server"> Sub OnCollapse( sender as Object, e as TreeViewClickEventArgs) 'append node index to the label control when tree is 'collapsed mylabel.Text += "<BR>Collapsed (Node Index = " & e.Node.ToString() + ")" End Sub Sub OnExpand (sender as Object , e as TreeViewClickEventArgs ) ' append node index to label control when tree is 'expanded mylabel.Text += "<BR>Expanded (Node Index= " & e.Node.ToString() + ")" End Sub
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Sub OnSelectedIndexChanged ( sender as Object, e as TreeViewSelectEventArgs) ' append node index to label control when a new node is 'selected in the tree mylabel.Text += "<BR>Selected " & e.NewNode.ToString() & " (oldNode Index=" + e.OldNode.ToString()+")" End Sub </script> <head> </head> <body> <h3><font face="Verdana">TreeView control demo</font></h3> <form runat="server"> <! render tree view control, setup event handlers for collapse, expand and selectedindexchanged events --> <mytree:TreeView runat="server" AutoPostBack="true" DefaultStyle="font-name:Verdana;font-size:12pt;color:black;" SelectedStyle=" font-face:Verdana;font-size:12pt;color:white;" OnCollapse="OnCollapse" OnExpand="OnExpand" OnSelectedIndexChanged="OnSelectedIndexChanged"> <mytree:treenode text="Asia"> <mytree:treenode text="China"/> <mytree:treenode text="India"/> </mytree:treenode> <mytree:treenode text="Africa"> <mytree:treenode text="Zaire"/> <mytree:treenode text="Zambia"/> </mytree:treenode> <mytree:treenode text="North America"> <mytree:treenode text="Canada"/> <mytree:treenode text="United States"/> </mytree:treenode> </mytree:treeview> <br> <asp:label id=mylabel runat="server">Event Log: </asp:label> </form> </body> </html> Figure 4-3 shows the output of the preceding code.
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Figure 4-3: Sample output of a TreeView control
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Using the TabStrip and MultiPage Controls
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The TabStrip control is used to present tabbed controls, which can be used along with the MultiPage control to display varied information in a given space. The TabStrip control renders tabs that users can click to switch between the different tabs. The MultiPage control is used to display multiple pages of data in a given screen area. This control is typically used with the TabStrip control. TabStrip control You use the following syntax to add a TabStrip control to a page: <tagprefix:TabStrip runat="Server" TabDefaultStyle=".." TabHoverStyle= ".." TabSelectedStyle=".." SepDefaultStyle=".."> <tagprefix:Tab text=".." > <tagprefix:Tab text="Node1.1"/> <tagprefix:Tab text="Node1.2"> </tagprefix:Tab> </tagprefix:TabStrip> The TabStrip control uses the following elements to define the tabbed interface to be rendered: TabStrip: Defines a TabStrip control, which acts as a container for the tabs and tab separators. Tab: Defines a tab element in the TabStrip control, which is rendered on the client browser as tabs on top of the tab strip. TabSeparator: Represents the separator bars between the tabs. Table 4-4 describes some of the properties of the TabStrip control. Table 4-4: Properties of the TabStrip control Property AutoPostBack Description Specifies whether or not the control
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Table 4-4: Properties of the TabStrip control Property Description posts back to the server on every client request. DefaultStyle Specifies the default style of the TabStrip control. Specifies the orientation of the tabs, which can be horizontal or vertical. Returns the index of the selected tab. Specifies the default style for the tab separators. Specifies the style to be applied to the tab separators when the mouse hovers over the separators.
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